Filipe Miguel Jesus Figueiredo

Researcher fellow since 2017.
Current interests: REE chemistry, waste valorisation, green hydrometallurgy, modelling of biphasic processes, scaling-up of chemical operations, chemical engineering project and the development of methods for XRF analysis.
Teaching assistant in the Physical Chemistry course (Graduation in Chemical Engineering, IST, 2022-2023), with focus in active learning and other STEM pedagogical techniques
Co-author to one peer-review Q1 scientific article and a poster at an international conference.
He participated in one course, seven short trainings on analytical techniques and methodologies, many workshops and a meeting designed to divulge science to the public.

EDUCATION

PhD student in Chemical Engineering (IST, UL, Portugal). Master of Chemical Engineering (IST, UL, Portugal). Currently researches the recovery of rare earth elements from e-waste with focus on circular economy and green hydrometallurgy principles, and enginnering project of chemical plants.

RESEARCH, TEACHING, or OTHER INTERESTS

Chemical Engineering, Chemistry, Waste Management and Disposal, Analytical Chemistry

Scopus Publications

A comprehensive review on Y and Eu recovery from cathode-ray tube phosphors
Filipe M.J. Figueiredo, João P. Leal, João Bordado, Fernando Durão, Joaquim Marçalo, and José P. Sardinha
Elsevier BV



Fast, accessible and reliable method for elemental analysis of metals in solution by ED-XRF spectroscopy
Filipe M. J. Figueiredo, José M. Carretas, João P. Leal, and José M. Sardinha
Springer Science and Business Media LLC
AbstractThe measurement of metals in solution is usually performed using inductive coupled plasma hyphenated techniques or atomic absorption. Although very sensitive and accurate, these analytical techniques are quite expensive and do not allow field measurements. The present work takes advantage of energy-dispersive X-ray fluorescence (ED-XRF) ease-of-use features to determine the concentration of rare earth elements (Y, Pr, Nd, Eu) and others (S, Fe, Ni, Cu, Zn) in aqueous solutions, after appropriate sample treatment. The approach turned out to be a reliable and very convenient procedure for field analysis. The simplicity, speed and reliability of the methodology used combined with the possibility of simultaneous analysis and low cost of the method can be advantageous in industrial context. The approach relies on the suspension of the target solutions in a cellulose matrix that is further converted into a pellet for direct analysis. Calibration curves obtained by regression analysis at 5% significance are shown for a variety of elements (S, Fe, Ni, Cu, Zn, Y, Pr, Nd, Eu) with correlation coefficients between 0.9555 and 0.9980. Higher coefficients of variance were obtained for the calibration of S and Pr due to low sensitivity and the overlapping with the L lines of Nd, respectively. The performed calibrations were not affected by the presence of other analytes in the matrix. Results obtained showed that it is possible to use the proposed methodology to accurately quantify d and f block metals in aqueous solutions by ED-XRF after sequestering the chemical content into a cellulose powder matrix and further processing into a pellet. Graphical Abstract


Determination of rare earth elements in CRT phosphors and NdFeB magnets residues using an ED-XRF portable spectrometer to assist field semi-quantitative screening
Filipe M.J. Figueiredo, M. Fátima Araújo, Joaquim Marçalo, João P. Leal, and José P. Sardinha
Elsevier BV



Application of ED-XRF spectra for determination of macroelements in edible seaweeds
Jelena Milinovic, Filipe M.J. Figueiredo, João Paulo Noronha, and José Sardinha
Elsevier BV

RECENT SCHOLAR PUBLICATIONS